Tripping device for printing-press cylinders.



H. G. LA BAT'I. TRIPPING DEVICE FOR PRINTING PRESS GYLIIIDERS.

APPLICATION FILED DBO. 1B, 1903. RENEWED JULY 14, 1911. 1,087,246.

Patented Feb. 17, 1914,

ljcg. i I mi F 27 28 /2 l 90 J e0 v III uuIuu III M lllllllllllllllfll I E zam .employcd TED STATES IiLIENT HOMER C. BATT, OF CHICAGO, ILLINOIS, ASSIGNOR TO WILLIAM J. HERRICK, 0F

' CHICAGO, ILLINOIS.

TRIPPING DEVICE FOR PRINTING-PRESS CYLINDERS.

Specification of Letters Patent.

Patented Feb.17,1914.

. Application filed December 18, 1903, Serial No. 185,625. Renewed July 14, 1911. Serial No. 638,581.

To all whom it may concern Be it known that I, HOMER C. LA Barr, a citizen of the United States, residing at Chicago. in the county of Cook and State of Illinois, have invented certain new and usefullmprovements in Tripping Devices for Printing-Press Cylinders, of which the following is a specification.

This invention is concerned with an automatic tripping device for paper handling machines such as printing presses.

Cylinder printing presses as generally constructed are provided with means for tripping the cylinder to throw thesame out of operation when necessary or desirable, and such means are commonly controlled by the operator through the medium of a suit.- able lever or other connection located within convenient reach and actuated by him when no sheet is delivered to the cylinder, to prevent inking ofthe platen, or when there is other fault in the operation of the press and. it is desired to avoid making an impression, asfor example when the sheet being delivered to the press is crumpled or torn or when a plurality of sheets is simultaneously delivered to the press.

The present nvention has for its'obj ect to provide mechanism for automatically operating the cylinder tripping means and which may of, the usual controlling mechanism employed for this purpose.

The invention consists of the combination and arrangement of parts hereinafter described, particularly pointed out in the appended claims, and illustrated in the accompanying drawings, in which- Figure 1 is an end elevation of the device showing the same in connection with the rear portion of the frameof a printing press; Fig.2 is aside elevation ofthe tripping device on an. enlarged scale; Fig. 3 is a top plan view of the same; Fig. 4 is an elevation of the-end f the device opposite to that seen in Fig. 1; and Fig. 5 is a view corresponding to Fig. 2, but with the connecting arm in its inactive position.

The invention is applicable to any type or printing press in which a cylinder is for. carrying the sheet against the form and provided with mechanism for tripping the cylinder to prevent the same from making an impression. and for restoring the cylinder automatically, or in any other manbe a-n'adjunct to, or independent ner, to throw the' same into operative position again for a subsequent impression. As the mechanism for tripping or throwing the cylinder out of operative position and for restoring the same may be of the usual and ordinary or any preferred construction I have deemed it unnecessary to illustrate the same; v

The present device is particularly adapted for use with automatic feeders for delivering the sheets to the printing press with which it is associated, and to this end may be provided with any suitable connection with an associated part or adjunct of the feeder and so arranged that upon the failure of the feeder to deliver a sheet to the cylinder, or by the delivery of a plurality of sheets or owing to any other fault in the operation of the feeder, the cylinder will be tripped.

It is to be understood, however, that the device is not restricted to this particular use and that it may be operated through the medium of any'suitable connection to control the device and adapted to be operated in any suitable manner. i

In Fig. l, 10 indicates the frame of an ordinary printing press, the cylinder, bed

and other operative parts not being shown. Journaled 111- any suitable manner, as in bearings 11 carried by the frame 10, is a shaft 12. The shaft 12 may be driven from a connection with the mechanism for operating the press or in any other preferred manner. In practice I prefer to employ the shaft 12 for communicating motion from the drive shaft of the printing press to the feeding machine with which the tripping device is associated. Secured to the frame 10, or to any other suitable support, is a bracket 13. This bracket is shown in the present instance as bolted to the bottom rail of the frame 10; and mounted thereon is a movable element to which is attached the operating connection leading to the usual mechanism for tripping the cylinder. The movable element may be, actuated in any preferred manner, as through the medium of the shaft 12, as hereinafter described. In the present embodiment of the invention the bracket 13 is provided on its rear face with a longitudinal way or groove 14, and the movable element takes the form of a slide are met

to the slide 15 is a connection, such as the cable 17, which leads to and is adapted to actuate the means for tripping or raising the cylinder.

Pivoted as at- 18, to theslide 15, is an arm 19, which extends outwardly from the frame 10, and is designed to be engaged in such manner as to be moved longitudinally and thereby to move the slide 15., To this end there is fixed upon and rotates with the shaft 12 an element which may take the form of a disk 20 and provided with a device adapted to engage the arm to couple it to the disk and which is of such character as to release the arm as soon as the cylinder has been tripped. The means for accomplishing this result may be variously embodied. In the present embodiment of the invention, the arm 19 is made substantially in the form of a latch, the free end thereof being provided with a lug or hook 21 which is adapted to be engaged by a shoulder 22 of a dog 23, pivoted at 25 on the disk 20. The dog 23 is held or sustained, during a portion of the rotation of the disk, in position to engage the latch 19, when the latter is released and moves into its active position, as by means of a cam 24. This cam in the construction shown, is rigid with an arm or extension 26 which projects outwardly from the bracket 13, and such arm is provided with an aperture through which the shaft 12 passes. The cam 24 projects in the path of the inner end of the dog 23, and is so located as to be engaged thereby as the dog is moving past the free or outer end of the latch. By this means the dog 23 is so held that its shoulder moves against the latch when the latter is released in the manner to be hereinafter described, and, as shown in Fig. 2, carries the latch with it thereby moving the slide. As soon as the cylinder has been tripped so as to be held out of contact with the form, the dog 23 passes out of'engagement with the cam, and,owing to the resistance of the latch and the rotation of the disk 20, is turned on its pivot so as to release its'shoulder from the latehp The dog 23, after the disengagement of the arm in the manner described, is r turned to its normal or active position, as by means of an expansion spring 26 attached at one end to the disk 20 in advance of the dog and at its other end to the dog beyond the pivot thereof, a stop 32 fixed on the disk serving to limit the movement of the dog under the stress of such sprin'g.

During the normal operation of the press the arm 19 is held in an inactive position,

that is to say with its hook 21 out of the path of the shoulder of the dog 23, and suitable means are provided for holding it in this position as well as for releasing the holding means when it is desired or necessary to trip the press cylinder.

its release by the dog 23.

menses In the present embodiment of the invention I show an electromagnet for accomplishing the result, although any other suitable means may be employed. The electromagnet 27 may be mounted on the bracket 13 above the arm 19 and have its armature 28 pivoted at its. upper end, as at 29, so as to depend in the position shown in Fig. 2. The end of the armature in its normal position, that is when the magnet is deenergized, projects in the path of and is engaged by a toe or extension 30 at the rear end of the arm 19, and when the parts are in this position the armature serves as a lock for the arm and holds it with its outer or hooked end elevated out of the path of the shoulder of the dog 21, as shown in Fig. 5. The armature is normally retained in and returned to its locking position upon the deenergization of the magnet by a spring 31.

Upon the energization of the magnet 27 its armature 28 is attracted, withdrawing its end from engagement with the toe 30 of the I latch 19, which then drops, as by gravity, so as to have its hook 21 lowered into the path of the shoulder on the dog 23, the latter at this point in the cycle of operations of the press having been moved up so as to engage the hook immediately after the latter drops into its path and being held in its active'position by the cam 24. The arm or latch is then pulled along by the dog 23 which, as soon as the tripping mechanism is operated, is released by the movement of the dog away from the cam 24 so that the cylinder may be restored to operative position in the usual manner.

- In the present instance I have shown a push button 33 in the circuitof the electromagnet 27 for energizing the latter, but it is to be understood that this is employed simply for the purpose of illustrating the operation of the device. In practice I prefor to energize the electromagnet by means of a device or devices controlled by the paper fed to the press. This control may be of-any suitable or preferred character, as

will be well understood by those skilled in the art, and need not be further explained.

Means are preferably provided for automatically' resetting the arm or latch 19 after The mechanism for accomplishing this result may be of any suitable form adapted to the attainment of the desired end. In the present instance the disk 20 is provided with a cam portion 34 on its periphery which is so located as to elevate the outer end of the arm 19 and restore it to its normal position as the arm becomes disenga ed from the dog 23. The arm 19 is provided with an offset located in the plane of rotation of the disk, and the 'offset preferably takes the form of an antiof the same by ing the tripping is lifted so that its toe 3O is moved out of the path of the end of the armature which, assuming the elect-romagnet to have been deenergized by the opening of the circuit, is retracted by its spring and engages the toe to hold the arm in its inactive position ready to be released by the closing of the circuit again.

A stop 36, fixed on the bracket 13 at the rear of the armature 28, serves to limit the movement of the armature on the retraction the spring 31, and a similar stop 37 may be provided to limit the upward movement of the arm 19 when raised by the cam 34. l

What I claim as new and desire to secure by Letters Patent is 1. In a device of the class described, the combination with a connection for operating the tripping mechanism of a paper handling machine, of means for actuating the connection and'comprising a rotating element, and a latch adapted to be automatically coupled thereto.

2. In a device of the class described, the combination with the connection for actuating the tripping'mechanism of an operating paper handling machine, of rotating means for moving the connection, a latch for'automatically coupling the moving means with the connection, and means for uncoupling the latch. 1

3. In a device of the class described, the combination with the connection for actuating the tripping mechanism of a paper handling machine, of a movable element to which the connection is attached, an arm pivoted on the element, a rotatable element, and means for detachably coupling the arm to the rotatable element.

4:. In a device of the class described, the combination with the connection for actuatmechanism of a paper handling machine, of a movable element to which the connection is attached, an arm pivoted on the element, a rotatable element, means for coupling the arm to the rotatable element, and means for uncoupling the parts.

5. In a device of the class described, the

combination with the connection for actuating the cylinder tripping mechanism of a printing press, of a slide to which the connection is attached, a latch slide, a rotating element, and means for coupling the latch to the rotating element.

6. In a device of the class described, the combination with the connection for actuating the cylinder tripping mechanism of a pr'intingpress, of a slide, a latch pivoted to the slide, a rotating element, means for coupling the latch to the element, and means for uncoupling the parts.

7 In a device of the-class described, the combination with the connection for actuatprinting press,-

pivoted to the ing the cylinder tripping mechanism of a of a slide to which the connection is attached, a latch pivoted on the slide, a rotatable disk,'means-carried bythe disk to engage the latch, and'means to hold the latch out of such engagement.

8. In a device of the class described, the

v combination with the connection for actuating the cylinder tripping mechanism of a printing press, of a slide to which the connection is attached, a latch pivoted on the slide, a rotatable disk, means carried by the disk to engage the latch, means to disengage the latch, and means to hold the latch out of such engagement.v

9. In a device of the class described, the combination with the connection for actuating the cylinder tripping mechanism of a printing press, of a normally inactive latch movable with the connection, means for engaging the latch to move the connection, means for disengaging the latch, and means for automatically restoring the latch to its inactive position.

10. In combination with the operating connection of a-press cylinder tripping device, of a :normally inactive latch movable with the connection, and means provided.

with a dog for engaging the latch to move the connection, and a cam to hold the dog in engagement with the latch.

11. In combination with the operating con- I V neetion of a press cylinder tripping device, of a latch movable with theconnection, a disk having a dog to engage the latch to move the connection andv then to release the latch, and a device for restoring the latch.

12. In a device of the class described, the combination with the connect-ion operating the mechanism for tripping a printing press cylinder, of a slide to which the connectionis attached, a normally inactive latch carried by the slide, means for holding the latch in its inactive position, means for releasing the latch, a rotating disk, a dog carried by the disk and adapted to engage the latch when the latter is released, and a cam to hold the dog in engagement' with the latch.

13'. In a device of the class described, the combination with the connection for operating the mechanism for tripping a printing press cylinder, of a slide to which the connection is attached, a normally inactive latch pivoted on the slide, a pivoted device for engaging the latch to hold the latter in its inactive position, means for releasing the pivoted device, a rotating disk, a dog pivoted on the disk and adapted to engage the latch when the latter is released, a fixed cam engaging the dog to hold it in engagement .latch, means for holding the latch in its inactive position, electromagnetic means for moving the holding means to release the latch, and a rotatable element for engaging the latch to move the latter when released.

15. In a device of the class described, the combination with the normally inactive latch, means for holding the latch in its inactive position, electromagnetic means for moving the holding means to release the latch, a disk, and a dog carried by the disk to engage the latch when the latter is released,

16. In a device of the class described, the combination with the normally inactive latch, an electromagnet Provided with an armature engaging the latch to hold it in its inactive position, means for energizing the magnet to withdraw the armature from its holding position, a rotating disk, and a dog pivoted on the disk and adapted to engage the latch when the latter is released.

17; In a device of the class described, the combination with the normally inactive -latch, an electromagnet provided with an armature engaging the latch to hold it in its inactive position, means for energizing the magnet to withdraw the armature from noe'aaae its holding position, a rotating disk,and a dog pivoted on the disk and adapted to engage the latch when the latter is released, means for holding the dog in engagement with the latch during a portion of the rotating of the disk, and means for restoring Ehe latch upon the disengagement of the 0g. 18. In a device of the class described, the combination with the normally 2 inactive latch, an electromagnet provided with an armature engaging the latch to hold it in its inactive position, means for energizing the magnet to withdraw the armature from its holding position, .a rotating disk, and a dog pivoted on the disk and adapted to engage the latch when the latter is released, a cam for holding the dog in engagement with the latch during a portion of the rotation of the disk, and a cam acting on the arm forrestoring the latch upon the disenga ement of the dog.

n testimony whereof I afiix my signature I in presence of two witnesses HOMER C. LA BATT. Witnesses: ARTHUR B. SEIBOLD,

ELIZABETH Monrron. 

